Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis

Autores
Drago, M.; Crespo, Enrique Alberto; Aguilar, A.; Cardona, L.; Garcia, Nestor Anibal; Dans, Silvana Laura; Prosser Goodall, Rae Natalie
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Carbon and nitrogen isotopic analyses of skull bone were used to investigate how sealing and the development of industrial fishing have affected the diet of the South American sea lion Otaria flavescens in northern Patagonia. Males from Tierra del Fuego were used as a control, as the species there was decimated by sealing, but industrial fishing is only poorly developed. The δ13C of both males and females from northern Patagonia increased from the 1940s to the 1970s, and then declined steadily. The decline in the slope was similar in both sexes, although females were more depleted in 13C than were males. The δ15N remained unaffected in males throughout the period, whereas that of females decreased from the 1940s to the 1970s and then stabilized. Conversely, no change was found in either the δ13C or δ15N in the skulls from Tierra del Fuego animals. As benthic prey off northern Patagonia are more enriched in 13C than are pelagic prey, the above results indicate increased consumption of benthic coastal prey in this region from the 1940s to the 1970s, when sea lions were decimated by commercial hunting, and increased consumption of pelagic prey since the 1970s, simultaneous with sea lion population recovery. Reinforced intraspecific competition and massive discard of pelagic fish likely contributed to the observed dietary shift, while the poorly developed industrial fishing off Tierra del Fuego did not facilitate a similar change there. Nevertheless, physical forcing related to regime changes observed in the Pacific Ocean since the 1970s may also have played a role.
Fil: Drago, M.. Universidad de Barcelona; España
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Aguilar, A.. Universidad de Barcelona; España
Fil: Cardona, L.. Universidad de Barcelona; España
Fil: Garcia, Nestor Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Dans, Silvana Laura. Universidad de Barcelona; España
Fil: Prosser Goodall, Rae Natalie. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Acatushún Museum; Argentina
Materia
BONE
DIETARY SHIFT
DISCARDED FISH
FISHERY INTERACTIONS
OTARIA FLAVESCENS
SOUTH AMERICAN SEA LION
STABLE ISOTOPES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/96094
Acceder
id CONICETDig_e2601c3578095e51f27e2a02da5477ea
oai_identifier_str oai:ri.conicet.gov.ar:11336/96094
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysisDrago, M.Crespo, Enrique AlbertoAguilar, A.Cardona, L.Garcia, Nestor AnibalDans, Silvana LauraProsser Goodall, Rae NatalieBONEDIETARY SHIFTDISCARDED FISHFISHERY INTERACTIONSOTARIA FLAVESCENSSOUTH AMERICAN SEA LIONSTABLE ISOTOPEShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Carbon and nitrogen isotopic analyses of skull bone were used to investigate how sealing and the development of industrial fishing have affected the diet of the South American sea lion Otaria flavescens in northern Patagonia. Males from Tierra del Fuego were used as a control, as the species there was decimated by sealing, but industrial fishing is only poorly developed. The δ13C of both males and females from northern Patagonia increased from the 1940s to the 1970s, and then declined steadily. The decline in the slope was similar in both sexes, although females were more depleted in 13C than were males. The δ15N remained unaffected in males throughout the period, whereas that of females decreased from the 1940s to the 1970s and then stabilized. Conversely, no change was found in either the δ13C or δ15N in the skulls from Tierra del Fuego animals. As benthic prey off northern Patagonia are more enriched in 13C than are pelagic prey, the above results indicate increased consumption of benthic coastal prey in this region from the 1940s to the 1970s, when sea lions were decimated by commercial hunting, and increased consumption of pelagic prey since the 1970s, simultaneous with sea lion population recovery. Reinforced intraspecific competition and massive discard of pelagic fish likely contributed to the observed dietary shift, while the poorly developed industrial fishing off Tierra del Fuego did not facilitate a similar change there. Nevertheless, physical forcing related to regime changes observed in the Pacific Ocean since the 1970s may also have played a role.Fil: Drago, M.. Universidad de Barcelona; EspañaFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Aguilar, A.. Universidad de Barcelona; EspañaFil: Cardona, L.. Universidad de Barcelona; EspañaFil: Garcia, Nestor Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Dans, Silvana Laura. Universidad de Barcelona; EspañaFil: Prosser Goodall, Rae Natalie. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Acatushún Museum; ArgentinaInter-Research2009-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/96094Drago, M.; Crespo, Enrique Alberto; Aguilar, A.; Cardona, L.; Garcia, Nestor Anibal; et al.; Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis; Inter-Research; Marine Ecology Progress Series; 384; 5-2009; 273-2860171-86301616-1599CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3354/meps08017info:eu-repo/semantics/altIdentifier/url/http://www.int-res.com/abstracts/meps/v384/p273-286/info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:52:12Zoai:ri.conicet.gov.ar:11336/96094instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:52:12.763CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
title Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
spellingShingle Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
Drago, M.
BONE
DIETARY SHIFT
DISCARDED FISH
FISHERY INTERACTIONS
OTARIA FLAVESCENS
SOUTH AMERICAN SEA LION
STABLE ISOTOPES
title_short Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
title_full Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
title_fullStr Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
title_full_unstemmed Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
title_sort Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
dc.creator.none.fl_str_mv Drago, M.
Crespo, Enrique Alberto
Aguilar, A.
Cardona, L.
Garcia, Nestor Anibal
Dans, Silvana Laura
Prosser Goodall, Rae Natalie
author Drago, M.
author_facet Drago, M.
Crespo, Enrique Alberto
Aguilar, A.
Cardona, L.
Garcia, Nestor Anibal
Dans, Silvana Laura
Prosser Goodall, Rae Natalie
author_role author
author2 Crespo, Enrique Alberto
Aguilar, A.
Cardona, L.
Garcia, Nestor Anibal
Dans, Silvana Laura
Prosser Goodall, Rae Natalie
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv BONE
DIETARY SHIFT
DISCARDED FISH
FISHERY INTERACTIONS
OTARIA FLAVESCENS
SOUTH AMERICAN SEA LION
STABLE ISOTOPES
topic BONE
DIETARY SHIFT
DISCARDED FISH
FISHERY INTERACTIONS
OTARIA FLAVESCENS
SOUTH AMERICAN SEA LION
STABLE ISOTOPES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Carbon and nitrogen isotopic analyses of skull bone were used to investigate how sealing and the development of industrial fishing have affected the diet of the South American sea lion Otaria flavescens in northern Patagonia. Males from Tierra del Fuego were used as a control, as the species there was decimated by sealing, but industrial fishing is only poorly developed. The δ13C of both males and females from northern Patagonia increased from the 1940s to the 1970s, and then declined steadily. The decline in the slope was similar in both sexes, although females were more depleted in 13C than were males. The δ15N remained unaffected in males throughout the period, whereas that of females decreased from the 1940s to the 1970s and then stabilized. Conversely, no change was found in either the δ13C or δ15N in the skulls from Tierra del Fuego animals. As benthic prey off northern Patagonia are more enriched in 13C than are pelagic prey, the above results indicate increased consumption of benthic coastal prey in this region from the 1940s to the 1970s, when sea lions were decimated by commercial hunting, and increased consumption of pelagic prey since the 1970s, simultaneous with sea lion population recovery. Reinforced intraspecific competition and massive discard of pelagic fish likely contributed to the observed dietary shift, while the poorly developed industrial fishing off Tierra del Fuego did not facilitate a similar change there. Nevertheless, physical forcing related to regime changes observed in the Pacific Ocean since the 1970s may also have played a role.
Fil: Drago, M.. Universidad de Barcelona; España
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Aguilar, A.. Universidad de Barcelona; España
Fil: Cardona, L.. Universidad de Barcelona; España
Fil: Garcia, Nestor Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Dans, Silvana Laura. Universidad de Barcelona; España
Fil: Prosser Goodall, Rae Natalie. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Acatushún Museum; Argentina
description Carbon and nitrogen isotopic analyses of skull bone were used to investigate how sealing and the development of industrial fishing have affected the diet of the South American sea lion Otaria flavescens in northern Patagonia. Males from Tierra del Fuego were used as a control, as the species there was decimated by sealing, but industrial fishing is only poorly developed. The δ13C of both males and females from northern Patagonia increased from the 1940s to the 1970s, and then declined steadily. The decline in the slope was similar in both sexes, although females were more depleted in 13C than were males. The δ15N remained unaffected in males throughout the period, whereas that of females decreased from the 1940s to the 1970s and then stabilized. Conversely, no change was found in either the δ13C or δ15N in the skulls from Tierra del Fuego animals. As benthic prey off northern Patagonia are more enriched in 13C than are pelagic prey, the above results indicate increased consumption of benthic coastal prey in this region from the 1940s to the 1970s, when sea lions were decimated by commercial hunting, and increased consumption of pelagic prey since the 1970s, simultaneous with sea lion population recovery. Reinforced intraspecific competition and massive discard of pelagic fish likely contributed to the observed dietary shift, while the poorly developed industrial fishing off Tierra del Fuego did not facilitate a similar change there. Nevertheless, physical forcing related to regime changes observed in the Pacific Ocean since the 1970s may also have played a role.
publishDate 2009
dc.date.none.fl_str_mv 2009-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/96094
Drago, M.; Crespo, Enrique Alberto; Aguilar, A.; Cardona, L.; Garcia, Nestor Anibal; et al.; Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis; Inter-Research; Marine Ecology Progress Series; 384; 5-2009; 273-286
0171-8630
1616-1599
CONICET Digital
CONICET
url http://hdl.handle.net/11336/96094
identifier_str_mv Drago, M.; Crespo, Enrique Alberto; Aguilar, A.; Cardona, L.; Garcia, Nestor Anibal; et al.; Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis; Inter-Research; Marine Ecology Progress Series; 384; 5-2009; 273-286
0171-8630
1616-1599
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.3354/meps08017
info:eu-repo/semantics/altIdentifier/url/http://www.int-res.com/abstracts/meps/v384/p273-286/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Inter-Research
publisher.none.fl_str_mv Inter-Research
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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